I like Pelles C and I have used it for some small projects in the past. That said, it has been a few years since I have used it. 64-bit support is a good thing and a no-brainer for compilers, but Pelles C is still lacking one major feature that many other C/C++ variants have: cross platform support. Pelles C is still Windows only which is a little bit disheartening and keeps Pelles C from being more popular.
Due to circumstances beyond my control, I am being forced to quit using PB for my current project, so I am having to move it out of PB in order to meet the deadline. Pelles C is what I am using because I am familiar with it. It will be nice to be able to provide a 64-bit version as an added bonus and let the installer do a check and determine which version to install.